Cost of Breeding in Oniscid Isopods: A Partial Review

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Oniscid isopods (Isopoda, Oniscidea) are able to provide extra developmental time to their young. This is done by having an internal oviposition: mature eggs are oviposited into the marsupium (brood pouch) where they undergo ermbryogenesis. That way the female increases the energetic cost, reflected in the loss in body mass during gestation and incubation (marsupial embryogenesis). This is the reproductive allocation (RA). Some isopod species extend this energetic support to their young by feeding and protecting them. This is the parental investment (PI). These subjects are discussed and reviewed. The production of young during the isopods' lifetime or the reproductive potential of the species (RP) are of major significance for the survival of a species. The RP depends on longevity and both breeding patterns and strategies of the species of isopods. These subjects are discussed and reviewed.